import difflib

def compare_strings(string1, string2):
    differ = difflib.Differ()
    diff = differ.compare([1,2,3], [2,3])
    return '\n'.join(diff)

string1 = "1\n2\n4\n5\n6"
string2 = "1\n2\n,\n3\n4\n5\n6"

difference = compare_strings(string1, string2)
print("Difference between the strings:")
print(difference)